I use to have about 10 cats scattered here there and everywhere. My mate Carcas the same - for creeper defense. He said earlier in the week that his cats were disappearing soon after breeding. I didn't pay much attention.

I then noticed my own cats were also vanishing. We have different colours so we know who owns them and both colours are disappearing.

I bred a cat, turned my back and poof - disappeared. I seem to have a 2 cat limit at the moment. If I bred the third cat then it simply disappears.

A bug? Server setting? Some population limit has been reached?

Most of our stuff is mob proof now, so it's more a curiosity than anything.

Now that you mention that, i remember weeks ago i found 3 of carcas pets sitting, real obidient, at the bottom of my nearby mine. He was very happy to get them back. I might go dungeon crawling to see if i can find them.